Including Plots

You can also embed plots, for example:

## Warning in colors(.): Some values were outside the color scale and will be
## treated as NA
## Warning in colors(.): Some values were outside the color scale and will be
## treated as NA
## Warning in colors(.): Some values were outside the color scale and will be
## treated as NA
## Warning in colors(.): Some values were outside the color scale and will be
## treated as NA

Note that the echo = FALSE parameter was added to the code chunk to prevent printing of the R code that generated the plot.